[issue11491] dbm.open(..., flag="n") raises dbm.error if file exists and is rejected by whichdb

[Denver Coneybeare]

Changes by Denver Coneybeare <denver.coneybeare at gmail.com>:


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nosy: +brian.curtin
versions: +Python 2.7, Python 3.1, Python 3.2

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue11491>
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